Improved performance of weighted histogram & added unit tests.
Added vuniverse().
Added dim() overload for scalars.
Added same_dims_or_scalar().
Added checks in mpfitfun() and linfit() for dimensions.
sex2deg now returns a boolean indicating success/failure of the
conversion.
Added remove_extension().
Minor performance improvement to getgal.
Added current directory to search path of compilers.
Fixed wrong indentation in file::write_table, added write_table_hdr.